Drug interactions
Betaxolol + Doxazosin
Severity: Moderate
Betaxolol and Doxazosin: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Combining an alpha-1 blocker with a beta-blocker produces additive blood pressure lowering. Orthostatic hypotension and dizziness may be more pronounced, especially after the first doxazosin dose or a dose increase.
What this interaction means in plain words
Betaxolol and Doxazosin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Betaxolol belongs to Cardiovascular; Doxazosin belongs to Genitourinary.
Why it happens
Additive antihypertensive effects through alpha-1 adrenergic vasodilation and beta-adrenergic blockade.
What to do
Begin doxazosin at a low dose, preferably at bedtime, and titrate gradually. Monitor standing and sitting blood pressure and warn the patient about postural dizziness.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Doxazosin
- Alfuzosin + Doxazosin Major
- Amifostine + Doxazosin Major
- Avanafil + Doxazosin Major
- Doxazosin + Dutasteride-tamsulosin Major
- Doxazosin + Phentolamine Major
- Doxazosin + Prazosin Major
Other interactions of Betaxolol
- Acebutolol + Betaxolol Major
- Aldesleukin + Betaxolol Major
- Amifostine + Betaxolol Major
- Amiodarone + Betaxolol Major
- Atenolol-chlorthalidone + Betaxolol Major
- Atenolol + Betaxolol Major
Frequently asked questions
Can I take Betaxolol with Doxazosin?
MediHelp rates the interaction as moderate. Betaxolol and Doxazosin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Combining an alpha-1 blocker with a beta-blocker produces additive blood pressure lowering. Orthostatic hypotension and dizziness may be more pronounced, especially after the first doxazosin dose or a dose increase.
How serious is the interaction between Betaxolol and Doxazosin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Begin doxazosin at a low dose, preferably at bedtime, and titrate gradually. Monitor standing and sitting blood pressure and warn the patient about postural dizziness.
What other medicines interact with Doxazosin?
MediHelp also lists interactions of Doxazosin with, for example, Alfuzosin, Amifostine, Avanafil. The full list is on the Doxazosin page.
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